What is the name of the Klingon flagship in Star Trek VI?

The Klingon flagship in Star Trek VI: The Undiscovered Country is Kronos One.

Kronos One carries Chancellor Gorkon as he travels toward peace negotiations with the Federation. After the destruction of Praxis devastates the Klingon Empire’s economy and environment, Gorkon’s government seeks an end to the long conflict with the Federation. The USS Enterprise is assigned to escort the vessel toward Earth.

The ship’s name is sometimes written Kronos 1 or Kronos One in reference materials, but Kronos One is the canonical answer expected for this question. “Kronos” is also an English rendering associated with Qo’noS, the Klingon homeworld, which can create additional spelling confusion.

The other options identify different things. The Negh’Var is a later Klingon warship, while Vor’cha is a ship class rather than the flagship’s individual name. Bird-of-Prey describes a broad Klingon vessel type, not Chancellor Gorkon’s specific command ship. In the film, the ship becomes central to the conspiracy when assassins attack Gorkon during the escort mission.